Automobile radial tire rubber material with excellent sound absorption performance, preparation method and tire

Abstract

The invention relates to an automobile radial tire rubber material with excellent sound absorption performance, a preparation method and a tire, and belongs to the technical field of automobile radial tires. The radial tire rubber material is prepared from the following raw materials in parts by weight: 40 to 60 parts of natural rubber, 30 to 50 parts of butadiene styrene rubber, 2 to 8 parts of guayule rubber, 10 to 20 parts of modified carbon black, 5 to 8 parts of nano clay composite material, 1 to 3 parts of polyethylene glycol, 3 to 6 parts of turpentine, 1 to 3 parts of zinc oxide, 1.5 to 2.5 parts of vulcanizing agent and 2 to 3 parts of anti-aging agent. After the carbon black is subjected to ultrasonic dispersion with an ammonium sulfate aqueous solution, vacuum drying and oxygen activation treatment, the number of surface active sites is remarkably increased, the dispersion uniformity in a rubber matrix is greatly improved, and the agglomeration phenomenon is effectively inhibited; nano clay is organically modified by hexadecyl trimethyl ammonium bromide and then compounded with raw silicone rubber, the interlayer spacing of a layered structure of the nano clay is obviously enlarged, and the interfacial compatibility with a rubber matrix is obviously enhanced.

Description

Technical Field

[0001] This invention belongs to the field of automotive radial tire technology, specifically relating to an automotive radial tire rubber material with excellent sound absorption performance, its preparation method, and the tire itself. Background Technology

[0002] When a car is in motion, the driving and braking torques of the wheel rim need to be transmitted to the tire through the bead protector. This makes the friction between the tire and the wheel rim particularly intense, thus placing stringent requirements on the wear resistance and fatigue resistance of the rubber material.

[0003] However, traditional rubber materials have significant shortcomings: on the one hand, their filler dispersion is poor and the interfacial bonding force with the rubber matrix is ​​weak. Under the high-frequency friction of the wheel rim, they are prone to wear and chipping, making it difficult to withstand the strong friction load brought by heavy loads, thus significantly shortening the tire's service life; on the other hand, the design of the antioxidant and heat-resistant aging system of traditional rubber is simple. Frictional heat generation can easily cause high-temperature degradation of rubber, leading to a rapid decline in core mechanical properties such as hardness and tensile strength, further deteriorating the wear resistance and fatigue resistance of rubber materials. Summary of the Invention

[0004] The purpose of this invention is to provide a radial tire rubber material, preparation method and tire with excellent sound absorption performance to solve the above problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] This invention provides a radial tire rubber material with excellent sound absorption properties. The radial tire rubber material comprises the following raw materials in parts by weight: 40-60 parts natural rubber, 30-50 parts styrene-butadiene rubber, 2-8 parts galena rubber, 10-20 parts modified carbon black, 5-8 parts nano-clay composite material, 1-3 parts polyethylene glycol, 3-6 parts turpentine, 1-3 parts zinc oxide, 1.5-2.5 parts vulcanizing agent, and 2-3 parts antioxidant.

[0007] As a further optimization of the present invention, the modified carbon black comprises the following raw materials in parts by weight: 35-45 parts carbon black, 1-3 parts ammonium sulfate, and 55-70 parts deionized water.

[0008] As a further optimization of the present invention, the method for modifying carbon black is as follows: ammonium sulfate is added to deionized water and stirred at 65 r / min for 20-30 min to obtain an ammonium sulfate aqueous solution. Carbon black is mixed with the ammonium sulfate aqueous solution and ultrasonically dispersed at an ultrasonic power of 200-500 W and a frequency of 20-40 kHz for 1-2 h. The mixture is then kept at a constant temperature of 30℃ for 18-22 h. The liquid is filtered off and the solid is taken.

[0009] The solid was dried in a vacuum at 80-120℃ for 2-4 hours. After drying, oxygen was introduced into the atmosphere at a flow rate of 0.5-2L / min for 20-30 minutes, and then the modified carbon black was obtained.

[0010] As a further optimization of the present invention, the nano-clay composite material comprises the following raw materials in parts by weight: 35-45 parts clay, 45-60 parts distilled water, 10-15 parts cetyltrimethylammonium bromide, 6-12 parts silicone rubber raw rubber, 5-10 parts tetraethyl orthosilicate, and 1-3 parts dibutyltin dilaurate.

[0011] As a further optimization of the present invention, the preparation process of the nano-clay composite material is as follows: clay is dispersed in distilled water until uniform, hexadecyltrimethylammonium bromide is added, stirred at 65 r / min for 20-30 min, and the flocculent material is obtained after filtering the water.

[0012] The flocculent material was filtered out of water and then dried under vacuum at 80-120℃ for 30 minutes to obtain an organic clay composite.

[0013] The organic clay composite was dispersed in toluene solvent, silicone rubber raw rubber was added, and the mixture was stirred at 65 r / min for 1-2 h. Tetraethyl orthosilicate and dibutyltin dilaurate were added and stirred until homogeneous to obtain the nano-clay composite material.

[0014] As a further optimization of the present invention, the particle size of the carbon black is 280 nm.

[0015] As a further optimization of the present invention, the antioxidant is 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

[0016] This invention also provides a method for preparing a radial tire rubber material with excellent sound absorption properties, comprising the following steps:

[0017] S1, the modified carbon black and nano clay composite material is dried in an oven at 105℃ for 1-2 hours to obtain the preform;

[0018] S2, polyethylene glycol is pulverized into powder and mixed evenly with the dried pre-formed material and zinc oxide to obtain the filler;

[0019] S3. Start the continuous internal mixer, preheat the mixing chamber to 80-90℃, set the rotor speed to 60-80 r / min, add natural rubber, styrene-butadiene rubber and silver guar rubber and mix for 6-10 minutes to complete the first stage of mixing; after the rubber compound completely covers the rollers, add filler and mix at 110-120℃ with constant speed for 5-8 minutes to complete the second stage of mixing; add turpentine and antioxidant, mix at 115-125℃ with constant speed for 2-3 minutes to complete the third stage of mixing and obtain the colloid;

[0020] S4. Transfer the colloid to a flat vulcanizing machine, add vulcanizing agent, pressure 10-12MPa, temperature 150-155℃ for 15-20min, and store at 25℃ for 12-18h to obtain radial tire rubber material.

[0021] The rubber material of radial tires for automobiles with excellent sound absorption properties is used in tires.

[0022] The beneficial effects of this invention are as follows: After ultrasonic dispersion, vacuum drying and oxygen activation treatment of carbon black in ammonium sulfate aqueous solution, the number of surface active sites is significantly increased, the dispersion uniformity in the rubber matrix is ​​greatly improved, and the agglomeration phenomenon is effectively suppressed; the nano clay is first organically modified by hexadecyltrimethylammonium bromide and then compounded with silicone rubber raw rubber, the interlayer spacing of its layered structure is significantly expanded, the interfacial compatibility with the rubber matrix is ​​significantly enhanced, and the sound absorption function of the rubber material is increased;

[0023] The modified carbon black and nano-clay composite material synergistically reinforces the tensile strength, elongation at break, and Shore A hardness of the blend system of natural rubber, styrene-butadiene rubber, and guar gum rubber. This allows the radial tire rubber material to maintain high tensile strength, elongation at break, and controllable hardness changes even after aging in hot air at 100℃ for 72 hours. The prepared rubber can meet the performance requirements of the radial tire field. Detailed Implementation

[0024] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0025] Unless otherwise specified, all methods used in this invention are conventional methods known to those skilled in the art, and all reagents and materials used are commercially available products.

[0026] In this invention, sulfur S-80 is selected as the vulcanizing agent; and silicone rubber raw material 110-2 is selected as the silicone rubber raw material.

[0027] Example 1

[0028] The method for modifying carbon black is as follows: 1 part ammonium sulfate is added to 55 parts deionized water and stirred at 65 r / min for 20 min to obtain an ammonium sulfate aqueous solution. 35 parts carbon black (particle size of carbon black is 280 nm) are mixed with the ammonium sulfate aqueous solution and ultrasonically dispersed at an ultrasonic power of 200 W and a frequency of 20 kHz for 1 h. The mixture is then kept at a constant temperature of 30 ℃ for 18 h. The liquid is filtered off and the solid is taken.

[0029] The solid was dried in a vacuum at 80°C for 2 hours. After drying, oxygen was introduced into the atmosphere at a flow rate of 0.5 L / min and stored for 20 minutes. The modified carbon black was then obtained.

[0030] The preparation process of the nano-clay composite material is as follows: 35 parts of clay are dispersed in 45 parts of distilled water until uniform, 10 parts of hexadecyltrimethylammonium bromide are added, the mixture is stirred at 65 r / min for 20 min, and the flocculent material is obtained after filtering the water.

[0031] The flocculent material was filtered out of water and dried under vacuum at 80°C for 30 minutes to obtain an organic clay composite.

[0032] The organic clay composite was dispersed in toluene solvent, 6 parts of silicone rubber raw rubber were added, and the mixture was stirred at 65 r / min for 1 h. Then, 5 parts of tetraethyl orthosilicate and 1 part of dibutyltin dilaurate were added and stirred until uniform to obtain the nano-clay composite material.

[0033] 10 parts of modified carbon black and 5 parts of nano-clay composite material were placed in an oven at 105℃ and dried for 1 hour to obtain the preform.

[0034] One part of polyethylene glycol is pulverized into powder, and then mixed evenly with the dried preform and one part of zinc oxide to obtain the filler.

[0035] Start the continuous internal mixer, preheat the mixing chamber to 80°C, set the rotor speed to 60 r / min, add 40 parts natural rubber, 30 parts styrene-butadiene rubber and 2 parts silver guar gum rubber and mix for 6 minutes to complete the first stage of mixing; after the rubber compound completely covers the rollers, add filler and mix at 110°C with constant speed for 5 minutes to complete the second stage of mixing; add 3 parts turpentine oil and 2 parts 4,4'-bis(α,α-dimethylbenzyl)diphenylamine and mix at 115°C with constant speed for 2 minutes to complete the third stage of mixing and obtain the colloid;

[0036] The colloid was transferred to a flat vulcanizing machine, 1.5 parts of vulcanizing agent were added, the pressure was 10 MPa, the temperature was 150℃ for 15 minutes, and the mixture was stored at 25℃ for 12 hours to obtain radial tire rubber material.

[0037] Example 2

[0038] The method for modifying carbon black is as follows: 2 parts ammonium sulfate are added to 62 parts deionized water and stirred at 65 r / min for 25 min to obtain an ammonium sulfate aqueous solution. 40 parts carbon black (particle size of carbon black is 280 nm) are mixed with the ammonium sulfate aqueous solution and ultrasonically dispersed at 350 W and 30 kHz for 1.5 h. The mixture is then kept at a constant temperature of 30 °C for 20 h. The liquid is filtered off and the solid is collected.

[0039] The solid was dried in a vacuum at 100°C for 3 hours. After drying, oxygen was introduced into the atmosphere at a flow rate of 1.5 L / min and stored for 25 minutes. The modified carbon black was then obtained.

[0040] The preparation process of the nano-clay composite material is as follows: 40 parts of clay are dispersed in 55 parts of distilled water until uniform, 12 parts of hexadecyltrimethylammonium bromide are added, the mixture is stirred at 65 r / min for 25 min, and the water is filtered to obtain flocculent material.

[0041] The flocculent material was filtered out of water and dried under vacuum at 100°C for 30 minutes to obtain an organic clay composite.

[0042] The organic clay composite was dispersed in toluene solvent, 9 parts of silicone rubber raw rubber were added, and the mixture was stirred at 65 r / min for 1.5 h. Then, 8 parts of tetraethyl orthosilicate and 2 parts of dibutyltin dilaurate were added and stirred until homogeneous to obtain the nano-clay composite material.

[0043] 15 parts of modified carbon black and 6 parts of nano-clay composite material were placed in an oven at 105℃ and dried for 1.5 hours to obtain the preform.

[0044] Two parts of polyethylene glycol were pulverized into powder and mixed evenly with the dried preform and two parts of zinc oxide to obtain the filler.

[0045] Start the continuous internal mixer, preheat the mixing chamber to 85°C, set the rotor speed to 70 r / min, add 50 parts natural rubber, 40 parts styrene-butadiene rubber and 6 parts silver guar gum rubber and mix for 8 minutes to complete the first stage of mixing; after the rubber compound completely covers the rollers, add filler and mix at 115°C with constant speed for 6 minutes to complete the second stage of mixing; add 5 parts turpentine and 2 parts 4,4'-bis(α,α-dimethylbenzyl)diphenylamine and mix at 120°C with constant speed for 2 minutes to complete the third stage of mixing and obtain the colloid;

[0046] The colloid was transferred to a flat vulcanizing machine, 2 parts of vulcanizing agent were added, the pressure was 11 MPa, the temperature was 152℃ for 18 minutes, and the mixture was stored at 25℃ for 16 hours to obtain radial tire rubber material.

[0047] Example 3

[0048] The method for modifying carbon black is as follows: 3 parts ammonium sulfate are added to 70 parts deionized water and stirred at 65 r / min for 30 min to obtain an ammonium sulfate aqueous solution. 45 parts carbon black (particle size of carbon black is 280 nm) are mixed with the ammonium sulfate aqueous solution and ultrasonically dispersed at 500 W and 40 kHz for 2 h. The mixture is then kept at a constant temperature of 30 ℃ for 22 h. The liquid is filtered off and the solid is taken.

[0049] The solid was dried in a vacuum at 120°C for 4 hours. After drying, oxygen was introduced into the atmosphere at a flow rate of 2L / min for 30 minutes. The modified carbon black was then obtained.

[0050] The preparation process of the nano-clay composite material is as follows: 45 parts of clay are dispersed in 60 parts of distilled water until uniform, 15 parts of hexadecyltrimethylammonium bromide are added, the mixture is stirred at 65 r / min for 30 min, and the flocculent material is obtained after filtering the water.

[0051] The flocculent material was filtered out of water and dried under vacuum at 120°C for 30 minutes to obtain an organic clay composite.

[0052] The organic clay composite was dispersed in toluene solvent, 12 parts of silicone rubber raw rubber were added, and the mixture was stirred at 65 r / min for 2 h. Then, 10 parts of tetraethyl orthosilicate and 3 parts of dibutyltin dilaurate were added and stirred until uniform to obtain the nano-clay composite material.

[0053] 20 parts of modified carbon black and 8 parts of nano-clay composite material were placed in an oven at 105℃ and dried for 2 hours to obtain the preform.

[0054] Three parts of polyethylene glycol were pulverized into powder and mixed evenly with the dried preform and three parts of zinc oxide to obtain the filler.

[0055] Start the continuous internal mixer, preheat the mixing chamber to 90°C, set the rotor speed to 80 r / min, add 60 parts of natural rubber, 50 parts of styrene-butadiene rubber and 8 parts of silver guar gum rubber and mix for 10 min to complete the first stage of mixing; after the rubber compound completely covers the rollers, add filler and mix at 120°C with constant speed for 8 min to complete the second stage of mixing; add 6 parts of turpentine oil and 3 parts of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine and mix at 125°C with constant speed for 3 min to complete the third stage of mixing and obtain the colloid;

[0056] The colloid was transferred to a flat vulcanizing machine, 2.5 parts of vulcanizing agent were added, the pressure was 12 MPa, the temperature was 155℃ for 20 minutes, and the mixture was stored at 25℃ for 18 hours to obtain radial tire rubber material.

[0057] Comparative Example 1

[0058] The preparation process of the nano-clay composite material is as follows: 40 parts of clay are dispersed in 55 parts of distilled water until uniform, 12 parts of hexadecyltrimethylammonium bromide are added, the mixture is stirred at 65 r / min for 25 min, and the water is filtered to obtain flocculent material.

[0059] The flocculent material was filtered out of water and dried under vacuum at 100°C for 30 minutes to obtain an organic clay composite.

[0060] The organic clay composite was dispersed in toluene solvent, 9 parts of silicone rubber raw rubber were added, and the mixture was stirred at 65 r / min for 1.5 h. Then, 8 parts of tetraethyl orthosilicate and 2 parts of dibutyltin dilaurate were added and stirred until homogeneous to obtain the nano-clay composite material.

[0061] 15 parts of carbon black and 6 parts of nano-clay composite material were placed in an oven at 105℃ and dried for 1.5 hours to obtain the preform.

[0062] Two parts of polyethylene glycol were pulverized into powder and mixed evenly with the dried preform and two parts of zinc oxide to obtain the filler.

[0063] Start the continuous internal mixer, preheat the mixing chamber to 85°C, set the rotor speed to 70 r / min, add 50 parts natural rubber, 40 parts styrene-butadiene rubber and 6 parts silver guar gum rubber and mix for 8 minutes to complete the first stage of mixing; after the rubber compound completely covers the rollers, add filler and mix at 115°C with constant speed for 6 minutes to complete the second stage of mixing; add 5 parts turpentine and 2 parts 4,4'-bis(α,α-dimethylbenzyl)diphenylamine and mix at 120°C with constant speed for 2 minutes to complete the third stage of mixing and obtain the colloid;

[0064] The colloid was transferred to a flat vulcanizing machine, 2 parts of vulcanizing agent were added, the pressure was 11 MPa, the temperature was 152℃ for 18 minutes, and the mixture was stored at 25℃ for 16 hours to obtain radial tire rubber material.

[0065] Comparative Example 2

[0066] The method for modifying carbon black is as follows: 2 parts ammonium sulfate are added to 62 parts deionized water and stirred at 65 r / min for 25 min to obtain an ammonium sulfate aqueous solution. 40 parts carbon black (particle size of carbon black is 280 nm) are mixed with the ammonium sulfate aqueous solution and ultrasonically dispersed at 350 W and 30 kHz for 1.5 h. The mixture is then kept at a constant temperature of 30 °C for 20 h. The liquid is filtered off and the solid is collected.

[0067] The solid was dried in a vacuum at 100°C for 3 hours. After drying, argon gas was introduced into the atmosphere at a flow rate of 1.5 L / min and stored for 25 minutes. The modified carbon black was then obtained.

[0068] The preparation process of the nano-clay composite material is as follows: 40 parts of clay are dispersed in 55 parts of distilled water until uniform, 12 parts of hexadecyltrimethylammonium bromide are added, the mixture is stirred at 65 r / min for 25 min, and the water is filtered to obtain flocculent material.

[0069] The flocculent material was filtered out of water and dried under vacuum at 100°C for 30 minutes to obtain an organic clay composite.

[0070] The organic clay composite was dispersed in toluene solvent, 9 parts of silicone rubber raw rubber were added, and the mixture was stirred at 65 r / min for 1.5 h. Then, 8 parts of tetraethyl orthosilicate and 2 parts of dibutyltin dilaurate were added and stirred until homogeneous to obtain the nano-clay composite material.

[0071] 15 parts of modified carbon black and 6 parts of nano-clay composite material were placed in an oven at 105℃ and dried for 1.5 hours to obtain the preform.

[0072] Two parts of polyethylene glycol were pulverized into powder and mixed evenly with the dried preform and two parts of zinc oxide to obtain the filler.

[0073] Start the continuous internal mixer, preheat the mixing chamber to 85°C, set the rotor speed to 70 r / min, add 50 parts natural rubber, 40 parts styrene-butadiene rubber and 6 parts silver guar gum rubber and mix for 8 minutes to complete the first stage of mixing; after the rubber compound completely covers the rollers, add filler and mix at 115°C with constant speed for 6 minutes to complete the second stage of mixing; add 5 parts turpentine and 2 parts 4,4'-bis(α,α-dimethylbenzyl)diphenylamine and mix at 120°C with constant speed for 2 minutes to complete the third stage of mixing and obtain the colloid;

[0074] The colloid was transferred to a flat vulcanizing machine, 2 parts of vulcanizing agent were added, the pressure was 11 MPa, the temperature was 152℃ for 18 minutes, and the mixture was stored at 25℃ for 16 hours to obtain radial tire rubber material.

[0075] Comparative Example 3

[0076] The method for modifying carbon black is as follows: 2 parts ammonium sulfate are added to 62 parts deionized water and stirred at 65 r / min for 25 min to obtain an ammonium sulfate aqueous solution. 40 parts carbon black (particle size of carbon black is 280 nm) are mixed with the ammonium sulfate aqueous solution and ultrasonically dispersed at 350 W and 30 kHz for 1.5 h. The mixture is then kept at a constant temperature of 30 °C for 20 h. The liquid is filtered off and the solid is collected.

[0077] The solid was dried in a vacuum at 100°C for 3 hours. After drying, oxygen was introduced into the atmosphere at a flow rate of 1.5 L / min and stored for 25 minutes. The modified carbon black was then obtained.

[0078] The preparation process of the nano-clay composite material is as follows: 40 parts of clay are dispersed in 55 parts of distilled water until uniform, 12 parts of hexadecyltrimethylammonium bromide are added, the mixture is stirred at 65 r / min for 25 min, and the water is filtered to obtain flocculent material.

[0079] The flocculent material was filtered out of water and dried under vacuum at 100°C for 30 minutes to obtain an organic clay composite.

[0080] The organic clay composite was dispersed in toluene solvent, 9 parts of silicone rubber raw rubber were added, and the mixture was stirred at 65 r / min for 1.5 h. Then, 8 parts of tetraethyl orthosilicate and 2 parts of dibutyltin dilaurate were added and stirred until homogeneous to obtain the nano-clay composite material.

[0081] 15 parts of modified carbon black and 6 parts of nano-clay composite material were placed in an oven at 105℃ and dried for 1.5 hours to obtain the preform.

[0082] Two parts of polyethylene glycol were pulverized into powder and mixed evenly with the dried preform and two parts of zinc oxide to obtain the filler.

[0083] Start the continuous internal mixer, preheat the mixing chamber to 85°C, set the rotor speed to 70 r / min, add 56 parts of natural rubber and 40 parts of styrene-butadiene rubber and mix for 8 minutes to complete the first stage of mixing; after the rubber compound completely covers the rollers, add filler and mix at 115°C with constant speed for 6 minutes to complete the second stage of mixing; add 5 parts of turpentine and 2 parts of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine and mix at 120°C with constant speed for 2 minutes to complete the third stage of mixing and obtain the colloid;

[0084] The colloid was transferred to a flat vulcanizing machine, 2 parts of vulcanizing agent were added, the pressure was 11 MPa, the temperature was 152℃ for 18 minutes, and the mixture was stored at 25℃ for 16 hours to obtain radial tire rubber material.

[0085] Performance testing

[0086] The radial tire rubber materials prepared by the methods of Examples 1-3 and Comparative Examples 1-3 were tested according to GB / T18022-2000 "Measurement of Longitudinal Wave Velocity and Attenuation Coefficient of Materials" and GB / T22036-2018 "Test of Tire Inertial Glide Noise". The test results are shown in Table 1.

[0087] Table 1

[0088] project Longitudinal wave attenuation coefficient dB / mm sound absorption coefficient Example 1 4.0 0.40 Example 2 4.5 0.40 Example 3 4.0 0.35 Comparative Example 1 3.0 0.15 Comparative Example 2 3.0 0.15 Comparative Example 3 2.5 0.15

[0089] As can be seen from Table 1, the longitudinal wave attenuation coefficient of the rubber in the example is 4.0-4.5 dB / mm, and the sound absorption coefficient is 0.35-0.40; while the longitudinal wave attenuation coefficient of the rubber in the comparative example is only 2.5-3.0 dB / mm, and the sound absorption coefficient is 0.15. The comparison shows that the rubber prepared in the example is significantly better than the comparative example in terms of sound wave loss capacity and sound absorption performance, and has a better overall performance in sound absorption and noise reduction.

[0090] (ii) The tensile strength and elongation at break of the radial tire rubber materials prepared by the methods of Examples 1-3 and Comparative Examples 1-3 were measured according to GB / T528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber"; the Shore A hardness of the radial tire rubber materials prepared by the methods of Examples 1-3 and Comparative Examples 1-3 was measured according to GB / T531.1-2008 "Test method for indentation hardness of vulcanized rubber or thermoplastic rubber - Part 1: Shore hardness test (Shore hardness)" and the test results are shown in Table 2.

[0091] Table 2

[0092] project Tensile strength / MPa Elongation at break / % Shore A hardness Example 1 26 658 55 Example 2 28 665 58 Example 3 25 663 55 Comparative Example 1 18 612 46 Comparative Example 2 19 623 48 Comparative Example 3 17 622 45

[0093] As shown in Table 2, the tensile strength of the rubber material in the examples is 25-28 MPa, the elongation at break is 658%-665%, and the Shore A hardness is 55-58; while the tensile strength of the rubber in the comparative examples is only 17-19 MPa, the elongation at break is 612%-623%, and the Shore A hardness is 45-48. The results show that the rubber material prepared in the examples is significantly better than the comparative examples in terms of tensile strength, elongation at break, and hardness, and has better overall mechanical properties.

[0094] (III) The radial tire rubber materials prepared by the methods in Examples 1-3 and Comparative Examples 1-3 were subjected to aging treatment according to the methods in GB / T3512-2014 "Accelerated Aging and Heat Resistance Test of Vulcanized Rubber or Thermoplastic Rubber in Hot Air" (aging treatment conditions: 100℃×72h). The radial tire rubber materials after aging treatment were tested for tensile strength, elongation at break and Shore A hardness according to GB / T528-2009 "Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber" and GB / T531.1-2008 "Test Method for Indentation Hardness of Vulcanized Rubber or Thermoplastic Rubber Part 1: Shore Hardness Tester Method (Shore Hardness)". The test results are shown in Table 3.

[0095] Table 3

[0096] project Tensile strength / MPa Elongation at break / % Shore A hardness Example 1 21 628 61 Example 2 22 634 65 Example 3 19 631 62 Comparative Example 1 10 576 58 Comparative Example 2 11 572 57 Comparative Example 3 9 571 56

[0097] As shown in Table 3, the results indicate that the tensile strength of the rubber material in the example after aging treatment is 19-22 MPa, the elongation at break is 628%-634%, and the Shore A hardness is 61-65; while the tensile strength of the rubber material in the comparative example is only 9-11 MPa, the elongation at break is 571%-576%, and the Shore A hardness is 56-58. The results show that the rubber material in the example still maintains better tensile properties and hardness after heat aging, and its heat aging resistance is significantly better than that of the comparative example.

[0098] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A rubber material for automotive radial tires with excellent sound absorption properties, characterized in that, The radial tire rubber material comprises the following raw materials in parts by weight: 40-60 parts natural rubber, 30-50 parts styrene-butadiene rubber, 2-8 parts silver guar rubber, 10-20 parts modified carbon black, 5-8 parts nano-clay composite material, 1-3 parts polyethylene glycol, 3-6 parts turpentine, 1-3 parts zinc oxide, 1.5-2.5 parts vulcanizing agent, and 2-3 parts antioxidant.

2. The automotive radial tire rubber material with excellent sound absorption properties according to claim 1, characterized in that, The modified carbon black comprises the following raw materials in parts by weight: 35-45 parts carbon black, 1-3 parts ammonium sulfate, and 55-70 parts deionized water.

3. The automotive radial tire rubber material with excellent sound absorption properties according to claim 2, characterized in that, The method for modifying carbon black is as follows: Ammonium sulfate is added to deionized water and stirred at 65 r / min for 20-30 min to obtain an ammonium sulfate aqueous solution. Carbon black is mixed with the ammonium sulfate aqueous solution and ultrasonically dispersed at an ultrasonic power of 200-500 W and a frequency of 20-40 kHz for 1-2 h. The mixture is then kept at a constant temperature of 30℃ for 18-22 h. The liquid is filtered off and the solid is collected. The solid was dried in a vacuum at 80-120℃ for 2-4 hours. After drying, oxygen was introduced into the atmosphere at a flow rate of 0.5-2L / min for 20-30 minutes, and then the modified carbon black was obtained.

4. The automotive radial tire rubber material with excellent sound absorption properties according to claim 1, characterized in that, The nano-clay composite material comprises the following raw materials in parts by weight: 35-45 parts clay, 45-60 parts distilled water, 10-15 parts cetyltrimethylammonium bromide, 6-12 parts raw silicone rubber, 5-10 parts tetraethyl orthosilicate, and 1-3 parts dibutyltin dilaurate.

5. The automotive radial tire rubber material with excellent sound absorption properties according to claim 4, characterized in that, The preparation process of the nano-clay composite material is as follows: clay is dispersed in distilled water until uniform, hexadecyltrimethylammonium bromide is added, and the mixture is stirred at 65 r / min for 20-30 min. After filtering the water, flocculent material is obtained. The flocculent material was filtered out of water and then dried under vacuum at 80-120℃ for 30 minutes to obtain an organic clay composite. The organic clay composite was dispersed in toluene solvent, silicone rubber raw rubber was added, and the mixture was stirred at 65 r / min for 1-2 h. Tetraethyl orthosilicate and dibutyltin dilaurate were added and stirred until homogeneous to obtain the nano-clay composite material.

6. The automotive radial tire rubber material with excellent sound absorption properties according to claim 2, characterized in that, The carbon black has a particle size of 280 nm.

7. The automotive radial tire rubber material with excellent sound absorption properties according to claim 1, characterized in that, The antioxidant is 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

8. A method for preparing a radial tire rubber material with excellent sound absorption properties as described in any one of claims 1-7, characterized in that, Includes the following steps: S1, the modified carbon black and nano clay composite material is dried in an oven at 105℃ for 1-2 hours to obtain the preform; S2, polyethylene glycol is pulverized into powder and mixed evenly with the dried pre-formed material and zinc oxide to obtain the filler; S3. Start the continuous internal mixer, preheat the mixing chamber to 80-90℃, set the rotor speed to 60-80 r / min, add natural rubber, styrene-butadiene rubber and silver guar rubber and mix for 6-10 minutes to complete the first stage of mixing; after the rubber compound completely covers the rollers, add filler and mix at 110-120℃ with constant speed for 5-8 minutes to complete the second stage of mixing; add turpentine and antioxidant, mix at 115-125℃ with constant speed for 2-3 minutes to complete the third stage of mixing and obtain the colloid; S4. Transfer the colloid to a flat vulcanizing machine, add vulcanizing agent, pressure 10-12MPa, temperature 150-155℃ for 15-20min, and store at 25℃ for 12-18h to obtain radial tire rubber material.

9. The automotive radial tire rubber material with excellent sound absorption properties as described in claim 8 is used in tires.